package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.minio.MinioProperties;
import com.atguigu.lease.web.admin.service.FileService;
import io.minio.*;
import io.minio.errors.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

@Service
public class FileServiceImpl implements FileService {

    @Autowired
    MinioClient minioClient;

    @Autowired
    MinioProperties minioProperties;

    @Override
    public String upload(MultipartFile file)
            throws ServerException, InsufficientDataException,
            ErrorResponseException, IOException, NoSuchAlgorithmException,
            InvalidKeyException, InvalidResponseException,
            XmlParserException, InternalException {

        try {
            //1 判断桶是否存在
            boolean bucketExists = minioClient.bucketExists(BucketExistsArgs.builder().bucket(minioProperties.getBucketName()).build());

            //2 不存在则创建
            if(!bucketExists){
                minioClient.makeBucket(MakeBucketArgs.builder().bucket(minioProperties.getBucketName()).build());

                minioClient.setBucketPolicy(SetBucketPolicyArgs.builder()
                        .bucket(minioProperties.getBucketName()).config(this.createBucketPolicyConfig(minioProperties.getBucketName()))
                        .build());
            }

            //3 构建上传文件路径 + 图片名称(注意：图片上传不能使用原始文件名称。否则同名文件被覆盖)
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
            String dateStr = simpleDateFormat.format(new Date());

            String path = dateStr+"/"+ UUID.randomUUID().toString().replaceAll("-","")+"-"+file.getOriginalFilename();

            //4.文件上传
            minioClient.putObject(PutObjectArgs.builder()
                            .bucket(minioProperties.getBucketName())
                            .object(path)
                            .stream(file.getInputStream(), file.getSize(), -1)
                            .contentType(file.getContentType()) //    image/jpg  image/png
                            .build());

            //5 返回图片url
            //String url = minioProperties.getEndpoint() +"/" + minioProperties.getBucketName() + "/" + path;
            String url = String.join("/",minioProperties.getEndpoint(),minioProperties.getBucketName(),path);
            return url;
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
    }

    //给桶授权策略：
    private String createBucketPolicyConfig(String bucketName) {
        //   %s  占位符
        //   模板字符串
//        String str = """
//                xxx
//                yyy
//                zzz
//                """;
        return """
            {
              "Statement" : [ {
                "Action" : "s3:GetObject",
                "Effect" : "Allow",
                "Principal" : "*",
                "Resource" : "arn:aws:s3:::%s/*"
              } ],
              "Version" : "2012-10-17"
            }
            """.formatted(bucketName);
    }

}
